I think it isn't fair to call CT-1320A, the Sound Blaster 1.5
CT-1320A is just the card found in early batch of Sound Blaster Box printed "24 voices sound card" [...] in front of the box (I prefer to classify it as SB 1.0 because every IC chip is soldered on board, except the DSP chip), bundled with C/MS Intelligent Organ, Talking Parrot, etc.
CT-1320B or CT-1320C with empty CMS socket found in later batch of Sound Blaster Box printed "All in one sound card" in front of the box, (This is the well known SB 1.5) bundled with FM Intelligent Organ, Talking Parrot, Dr Sbaitso, Voxkit, etc.
My CT-1320C has got "VERSION 1.5" in the bottom-left corner of the box and also
on the first page of the manual
Patrick Chang could you check your CT-1320A's box and manual for that info?
And also do you see any differences between your box and the box on this page? http://www.atarimagazines.com/compute/issue115/396_1_ENTERTAINMENT_BLAST_THE_PC_SOUND_BARRIER_WITH_THIS_CREATIVE_CARD.php